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Power - Pentode Single (NOT beam) (under 10W) ·Pentode

R123

Long-life professional power-amplifier pentode providing approximately 2 W output.

Directly heatedCold cathodeCommon cathodeDissimilar
Sections
1
Base
-
Socket code
B9A
Base pins
9
Nominal heater
18 V / 400 mA

Description

Long-life power-amplifier pentode.

Socket description

Small-button Noval 9-contact

General specifications

Tube and section characteristics

Properties common to every published source and operating point.

Heater and base

Base
-
Socket code
B9A
Base pins
9
Nominal heater voltage
18 V
Nominal heater current
400 mA
Parallel heater voltage
-
Parallel heater current
-
Series capable
No

Terminal pinout

Electrical assignments shared by every tube using this base designation.

No verified pinout is recorded for this base designation.

Section ratings

1 physical section, each with unique specifications.

Section 1

Pentode

X-ray radiationInterelectrode capacitances
Transconductance
0.0085 S
Max plate voltage
225 V
Max screen voltage
225 V
Max plate dissipation
8 W
Max screen dissipation
1 W
Max cathode current
45 mA

Pentode section; promoted values are taken from the approved source where explicitly published.

Source-dependent data

Operating conditions by source

Each block preserves the test conditions and published values from one reference. Values from different sources are intentionally kept separate.

Data set 01

1953 La Radiotechnique

Published operating points and test conditions from this source.

SECTION 1

Pentode

Characteristic

  • Indirect (cathode isolee du filament)

    18 V

    Pentode

Other

  • Plate voltage

    200 V

    Pentode

  • Screen-grid voltage

    200 V

    Pentode

  • Control-grid voltage

    -5 V

    Pentode

  • Screen-grid current

    5 mA

    Pentode

  • Plate resistance

    0 ohm

    Pentode

  • Output power

    2 W

    Pentode

  • Plate voltage

    225 V

    Pentode

  • Screen-grid voltage

    225 V

    Pentode

  • Plate dissipation

    8 W

    Pentode

  • Screen-grid dissipation

    1 W

    Pentode

  • Cathode current

    45 mA

    Pentode

  • Grid-circuit resistance 1

    1 Mohm

    Pentode

  • Resistance entre filament et cathode Rkf

    5000 ohm

    Pentode

  • Heater-cathode voltage

    50 V

    Pentode

  • Control-grid voltage

    5 V

    Pentode

  • Plate current

    35 mA

    Pentode

  • Load impedance

    7500 ohm

    Pentode

Capacitance

  • Input capacitance

    14 pF

    Pentode

  • Output capacitance

    13 pF

    Pentode

  • Coupling capacitance

    5 pF

    Pentode